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Products > Condensation Cure Silicone Rubber > Mold Making Silicone Rubber > Arts & Crafts Mold Making Silicone Rubber - 25A
Product name : Arts & Crafts Mold Making Silicone Rubber - 25A
Item : 201683182851
Model No. : RTV-573, 886, 103
Composition : Condensation/Tin cure type
Product Usage : 
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Details:
 
2 PartRTV Condensation Cure Type Silicone Rubber for Arts & Crafts Mold Making 

Description:

RTV-573, 886, 103 are two-component RTV Condensation/Tin cure type silicone rubber compounds for mold making. The two component system consists of a silicone rubber base (Part A) and curing agent/catalyst (Part B).

 

Applications:

It is an excellent material that can be used to make replicas with reproducing the finest detail and the shape of original, it suitable for a variety of industrial and art related applications, such us making molds for reproducing prototypes, architectural and furniture elements, sculpture, crafts, art objects and similar items, etc…

It can be used to cast a variety of materials including wax, gypsum plasters, concrete, polyester or epoxy resins, polyurethane, and low melt alloys/metals.

 

Features:

Easy de-molding;

Good tensile and tear strength

Medium hardness

Reproduce fine details.

 General Properties

Model No.

RTV-573

RTV-103

RTV-886

Before Curing

Color (A Part)

White

White

White

Appearance

Viscous Liquid

Viscous Liquid

Viscous Liquid

Viscosity A (25°C , mPa.s)

30,000

40,000±5,000

50,000

Curing Agent

(Standard Added Amount)

100# (3%)

55# (5%)

100# (3%)

55# (5%)

100# (3%)

101# (5%)

Pot Life (25°C, 65% RH)

10 minutes

12 minutes

10 minutes

Curing Time

80 minutes

90-120 minutes

90-120 minutes

Cured Elastomer (after 7 days cure at 23+/-2°C and 65% relative humidity)

Hardness

25° Shore A

24±1° Shore A

24±1° Shore A

Tensile Strength

2.9 Mpa

3.4±0.1 Mpa

3.8±0.1 Mpa

Tear Strength

18 kN/m

19±1 kN/m

27±1 kN/m

Elongation at Break

300%

550%

350%

Linear Shrinkage

≤0.3%

≤0.3%

≤0.3%

Temp. Range

-50°C to 200 °C

-50°C to 200 °C

-50°C to 200 °C

 Remark: All values are typical and should not be accepted as a specification.

How to use

            1. Preparation: 
The surface of the original should be clean and free of loose material. If necessary, and in particular with porous substrates, use a suitable release agent such as petroleum jelly or soap solution. 

2.       2. Weighing: 
Weigh out a certain amount of base compound and add the appropriate catalyst into a clean plastic or metal container. 
Note that the weight of the bases and catalyst must be weighed accurately.

3.      3. Mixing: 
Mix thoroughly. Fully stir 
until the catalyst is completely dispersed in the base, using the color contrast to achieve homogeneity.
Hand or mechanical mixing can be used, 
stir slowly at first to avoid splashing and taking care to avoid excessive air entrapment, but do not mix for an extended period of time or allow the temperature to exceed 35°C.

4.      4. De-gassing: 
Stop the mixer and scrape the vessel walls a few times. To prevent imperfections due to bubbles in the cured rubber,
 it is strongly recommended to eliminate any entrapped air by using intermittent evacuation in a vacuum chamber for a few minutes, allowing the mix to completely expand and then collapse.

5.       5. Pouring and Curing: 
If the mix be inspected and free of air bubbles, 
pour the mixed base and catalyst as soon as possible onto the original, avoiding air entrapment. The catalyzed material will cure to a firm, flexible rubber.
Let the rubber cure enough before de-molding. To allow the rubber to achieve its maximum physical properties and chemical resistance, leave the partially cured rubber to age at room temperature for several further hours.

6.       6. Mold Performance & Storage:
The physical life of the mold depends on how you use it (working temperature, materials cast, frequency, etc.). So molds should be checked periodically during long production runs.

Molds should be stored on a level surface in a cool, dry environment. And before storing, the mold should be cleaned with a soap solution and wiped fully dry. Two part (or more) molds should be assembled.

Packaging

Part A: Silicone Rubber base is supplied in 5kg/pail, 25kg/pail.

Part B: Curing Agent/Catalyst is supplied in 0.375kg/plastic bottle, 0.75kg/plastic bottle.

Arrangements can be made to supply in other pack sizes.

 

Storage, Shelf Life and Shipping

1.      Store in original, unopened containers below 30 °C. Keep them in a dry, cool, dark location. This product has a usable life of 6 months from the date of production.

2.      The curing agent may denature after opening. Keep all catalyst containers tightly sealed when not in use. Take particular care under conditions of high temperature or humidity.

3.      These products have a limited shelf life and should be used as soon as possible.

4.      The products are non-dangerous goods, and can be transported as common chemicals. 


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